Apparatus for the manufacture of welded tubes



. 1 D. W. CHISHOLM. APPARATUS FOR THE MANUFACTURE OF WELDED TUBES.

APPLICATION FILED APR.Z5, 19I9.

5 SHEETS-SHEET 1.

' D. w. CHISHOLM. APPARATUS FOR THE MANUFACTURE OF WELDED TUBES.

. APPLICAT ION FILED APR-25, 1919. 1,380,356

Patented June 7, 1921.

5 SHEETSSHEET 2- D. W. CHISHOLM.

APPARATUS FUR THE MANUFACTURE OFWELDED TUBES. APPLICATION FILED APR.25,1919,

5 SHEETS-SHEET 3- Patented J fine 7, I921.

D. W. CHISHOLM. APPARATUS? FOR THE MANUFACTURE OF WELDED TUBES.APPLICATION FILED APRZS; 1919.

1,38QS56W Patented June 7, 1921 5 SHEETS-SHEET 4- D. W. CHISHOLIVLAPPARATUS FOR THE MANUFACTURE OF WELDED TUBES.

APPLICATION H LED APR.25, 1919.

' 5 SHEETSSHEET 5- Patented 5mm '7 1&2

seee

BEIABATUS FOB THE MANUFACTURE OF WELDED Specification of Letters Patent.

lmitented June I, 1592i.

Application filled April 25, .1919. Serial No. 292-,722.

To all whom it may concern."

Be it known that I, DOUGLAS lvnzzusrnii CnIsHoLM, of Woodhead,Garnk'n-k, Lenurkshire, Scotland, a subject of the King of GreatBritain, have invented certain new and useful Improvements Relating toA1)- iu'atus for the Manufacture of Welded ubes, of. which the followingis o specification.

This invention relates to the manufacture of butt'yvelded'steel and irontubes.

In the commercial manufacture oi". butt welded tubes itis usual nofollow the old, and Well known process of drawing a heated strip out(if-the furnace and then seizing it by means of the drew bench tongs andpulling it, by the action of the draw bench chain, through a bell or dieso shaped t0 first turn u or skelp the strip end then close and Wei it.Usually or iron tubes which do not require to stand eat internalpressure, at single pass is sufficient but for stronger iron tubes orfor steel tubes two or more passes are necessary. For each pass it isnecessary to re-lieet the tube before passing it again through the dieor hell.

By means of the present invention '1 so improve this process that ironand steel tubes of the best quality can be produced at a single passthrough the die or hell, the weld being so satisfactory that she tubescan be readily used in place off the ordinary lap welded and weldlesstubes, and, further, not only can tuber: of sizes which ereusuelly buttWelded be nzinutactured by the improved process but also tubes of thelarger sizes and such as are usually lap welded.

Various methods have heretofore ln en proposed to achieve the someresults these have not, 0 my knowled been conmerciully successful andhave foiled to displace the old process of mzinuieceure.

Under my invention I drew the strip through an incomplete hell or diewith vi bich u positively driven rotary 2'. ember coacts in closing andWeldii ne strip, which letter, 215 it passes through the hell or die, isacted on by oxygen gas (or o ier sultublefor welding purposes) om...

through the incomplete portion of the or die, on to the edges of thestrip in order to bring them to the heat necessary for elffectivelywelding the edges together (here-- inzifter referred to es the properwelding heat).

look heated pi'efe ably from the chain wheel of the d -aw bench, whilethe gas is directed by means of i gas nozzle preferably arranged in,proximity to and just in advance of the rotary member. The rotary memberhas, or inay have a. device for automatically scraping or cleaning it.The rotery member, the gas nozzle, the scraper end, else, if desired, a,mandrel, are carried on a shaft mounted in suitable hearings on onextension of thehousing frame of the hell this shaft being capable ofbeing turned by means of a handle, or otherwise, so as to more therotory member, gee nozzle, etc, into and out of operative position asdesired.

The gas supply is, preferably, controlled l by means or a cock or valvecapable of being automatically opened and closed by the xnovernene ofthe shaft aforesaid. the arrangemeni, preferably, being such that whenthe rotary member and gas nozzle are moved into operetiveposition thegas is uutonia.ti celly turned on and when the gals nozzle and miserymember are moved out of operative positionthe is eutomat-icelly turnedoil.

in order the invention may be clearly understood. 1 have hereuntoappended e25 plunuloi'y drawings which show, by may ofillustration orexample, one mode of carrying out the invention in actual practice.

Figure l is at side elevation showing port of s. drew bench Elli/ll myimprovements arranged in connection therewith.

2 is a corresponding end elevation 'ng in the direction oi the arrowFig. 1.

3 is u back end View oi the hell or die. Fig. 3 is a corresponding planView.

Fiq. l is a heck end view of "the die or hell with the. roller inposition. Fig. 4 is a corresponding plan view.

Fig. 5 is a cortical section to on enlarged scale on line Fig. 3.

Fig. 6 is a correspondingside VlGW but with the roller mandrel, etc,mowed out of position. The el'niin drive is also shown,

Fig. 7 is a corresponding view to 6.. but from the opposite side andwith the roller in. position.

Fig. 8 shows detail. views oi ebe gas coal: eon oection. v En the dreWings the reference lehers l} l.1l1lfllS wherever repealed indicme someparts. i

a is the usual drew bench, 7) the usual :f'rone ,sproelset wheel, a thedraw bench small gap made in it as shown at 4.

chain, d the frame or housing for the closing bell or the, e the furnacefor heating the strips and 7 a strip which is being drawn erably thebell is cut away at the parts 2, 2,-

the cut away parts extending the greater part of length of the upperside of the bell from the back, or narrow end, to near the front endwhich latter is either leit intact as shown at 3 (Figs. 3 and 3*) or hasa (Figs. 4. and l 'Z are the usual lugs of the bell which fit into theusual recesses 8 of the frame when the bell is dropped into place.Located so as to be, when in working position, just over the rear end ofthe ball so as to be capable of c oecting with it in closing and weldingthe strip, is a rotarymemberpreferably a small roller 5-which has acircumferential groove '5 in it, this groove being of such curvatureasto complete the circle at the rear end oi the bell, see Fig. 4. Thisroller is positively driven.

In the construction shown the roller is driven "from the chain wheel 5of the draw bench by means of the spur wheel 7 (on the spindle 8 ofwheel. 3)) change wheel 9, sprocket wheel 12, chain 1.3,sprocket wheels14, 15, 16 and chain-l7. The change wheel 9 is mounted on a stud 10carried by a bracket 18 adjustably secured to the draw bench. The wheel12 is keyed to the ex tended hub 11 of the wheel 9. The wheels 14: and15 are bot-h secured to a sleeve 19 rotatably mounted on the shaft 20,being held againstlateral movement by collars 21. 22. The wheel 16 issecured to the end of the roller spindle 23. The shaft 20 is carried inbearings on upward extensions or arms '26 formed in one with the housing(l. The

shaftQO can be turned by a hand lever 27. Extending downward from thebosses 28 on the spindle 20 are two radial arms 29 which carry thebearings 24 for the spindle 23 and roller 5. The plate 30 which issecured to the bearings carries a nozzle 81 for directing gas on to theedges of the strip and a small mandrel 33. A scraper 32 for scraping andcleaning the groove of the roller may be secured to a plate 32 fastenedto the bearings. The mandrel is secured to the plate 30 by a curved arm34. The nozzle 31 is made broad and flat, as shown, with one, or more,narrow slits oroutlets for the gas, the nozzle being so shaped as toproperly direct the gas, through the incomplete portion of the bell,onto the strip, eh the edges and the parts in the iiilmfidiate' neighborlicensee hood thereof, to bring the metal at the seam to the properwelding heat. As will be seen (Fig. 5) the nozzle projects downward atthe. incomplete portion of the bell and is inclined so as to direct thegas at an angle on to the edges of the strip just before the same areacted on by'the roller.

The part 3 of the bell is left intact when there is room enough to allowof the mandrel 33 swinging clear but when there is not enough room a gap4 wider than the mandrel. is made in the part The gas is supplied from a'cylinder or other suitable source of supply at a suitable pressureinpractice .I have found a pressure of 25 to 30 lbs. per square inch togive excellent results when oxygen gas is used, the pressure beingregulated by means of a suitable cock or valve. The gas is conveyed by apipe 36 to a plug cock 3'? and from thence by a flexible pipe 38 to thenozzle 31.

The plug 39 of the cock (see Fig. 8) .is square ended and is secured ina corresponding hole at the end of the shaft 20 so that when the shaftis turned the plug is turned to open close. the cock.

I prefer to arrange that the draw bench chain. shall move at a speedhigher than that of the roller; thusffor butt welded steel tubes, oneinch gas size, the draw bench chain c is driven at the rate of about 247feet per minute while the roller is geared i so as to revolve at asurface speed of about.

The scraper, as will be seen, Fig. fl' is;

curved at its end to conform to the groove of the roller and the nozzleis likewise curved at its end to con: arm. to the curvature of the tube.V

The arrangement is such that by simply moving the hand lever 27, theroller, gas

nozzle, mandrel and scraper can be moved into and out of operativeposition, as desired, and, at the same time, the gas be turned on andoil'. This is a very impo ant factor in the successful carrying out o.the

process as it is essential the gas be t on and off at the proper timesand. with the minimum of waste. chain drive the roller is alwaysoperably connected with the draw bench.

Owing to the special The arrangement whereby the roller, etc,

can be readily turned or swung up is a gi'eat advantage as it enablesthe bell to be quickly changed and the gas nozzle to be examined andcleaned whenever necessary. The gas nozzle and roller maybe nlcelyadjusted in position by means of adjusting screws 40 on arms ll, asindicated in dotted lines, Figs. 2 and 7,

fix

remorse The strip, heated in the furnace as usual, 15 entered into thehell or (he and seized; by i he draw benrii cones and 1s rsKeijoe-i andWelded. under the-influence sheiiy iiiej co-action of the beii androiiciz As shown on the Lilii'WiI" the epparaius is constructed and theveil ,i made for cineing the seam of rive per side of the. hell but ewnstruetien may obviousiy be ziitereii and the cpenir be arranged in anyother suitable pesitien,

in nil cases prefer to use oxygen gas as have found it to giveereeiieniresuiteimt 1 do not (:enfine Iimi'eto as ii is "vions otherimown ggge used for welding purposes may be enipioyed, such asoxyacetylene gas, for-example. I have myseif iried quite a number ofgases with the objecb of raising? the edges the strip to the prone?Welding; heat but I have found none so m tziine for ii'lis purpose as;ox i'gei'i. 7-

eriy regulate and it was iiable to burn both the tubes and the cells.

Hevin new foiiy described. my invention what I (1min) and desire tosecure by Letters ute-Iii I- 1 Apparatus for manufacturing out; weldedrobes from heated meta} strips having 1n emnbrnation, a bell throughwhich the heated strip isrirawn and, having a gap therein, a rotarymember operniing in said gap and cone-sing with the bell to weld thetube means for directing inio the bet thmoflh mid gap and upon thestrip, and mans for drawing the strip through beii.

2. iippzira 'no welded bribes:

" "i fi'izrii'ig' been hen-red metal strips ing, in cmnbinaiu-on, a boilHmong}; which the heated strip drawn and hi .5 2:, gm) therein, :1rotary member opernii 552p and cozifl ngg with the beii io weid theinbe, means nositiveiy driving the ro- "y member we a for directing gasinto iziie beii Liirmw'ii said and upon time ip, m in u-g'ii the mail4-111 upgw 'aizns for manufacturing bun; welded tubes rom neaaezi. mete?strips, hav ing, in CO'i'Dbil'iiliiOiL, ,1 bell through. which theiifizit8i sirip is cirawn anciimvmg r. therein, a, :izary membereo-acting with the nominee posiaireiy driving die ro 'aary inciin'bor,ineens whereby file rotary member can be moved into Lin-5i. out ofaciien, means for (iirec n5; i= 1 the bail iaim 5 611 gap-em? npon the sin, i'neans- 1i rawing Eiui'ip iorougii trio be 1, 1nd means whereby thegas is turned on and off by hire more men; of the ro'mry member into andour, of action? igh ing, ccmoinmiien a bell through. which skeiped scrip{ii the upiene i found to be fiery oiffieuir be prop for drawing theSiZZip ,ei the :inii 'il, means fer (iireeiing inter the the the beiiire'ug'n s'qisi gap and upon the atria and means QZQWIDQ file eta-1p ini inc 5" ii.

- Annpparoius rnrimifaciuring imtt 5 bar- Weicie. tubes from heated inii. stri ing, in rebirm-zion Le in 74 the iieaiec i strip i5 drawn, saidbell havinga therein, ()Pi'flbllig in said gap and eofineraizing wiihiiie bell to close i'ne edges izhe strip v ineens r directing gas to thebeii ihrongii. said and. Winn the 1 sirip and drew Eo'ench means forwaiving ihe in through the beii.

6, Apparatus for manufacturing bntis' welded cubes from heated metalstrips having! in combination, befi through which the heated strip drawnand having: a therein. means for directing: go's inte the be i fliroughsaid gap and upon the strip, means for turnii'ig" the gas on and ci, arotary member co-actin z with the bell for pcsitiveiy driving the arymember, means whereby the rotary member can be moved into and our ofvition and means for drawing the strip through the bell the means fort'rlrning iiie gas on and oii" being}; opemteci by the means for movingthe roterry member into and out of action.

7. Apparatus for manufacturing butt weideti tubes from heatefii metalstrips" haw inn. in combination, a beii with an ripening at its upperside; roiier co-ziciing with the beiL the periphery of the r'oiier beingshaped to coincide with the inner W211i of said beiL means carrying theroii r, (i nomie for direeting ilhflfllgik the opening inic' said beii,means for snppiyi as to said nozzle and nieiins eoniroiiin gas supp y 8.Apparatus for imnufncturing but; weided cubes from neat ii r'neceistrips imvmg, in. (mllblildi'JOIl 21 be! ti; on opening ihednner wnli ofthe beii. means for positively rotating said roller, means carrying theroiier, 2i nozzle For directing through the opening into said beii meansfor supplying gas to said nozzzie anc'i means conii'roiiing said gassnppiy,

9. Apparatus for manufiacturing Weider]. tune" from heated ineizaistrips having, in corn nn en, a beii with an onening rt its upper @nie e:reiier co-eetir f with io 'izeii ciiain and airer merns positivelyroizating said roiler, means carrying the roiier 2a nozzle for directinggas through the opening into said bcli, Insane for supplying tonomzieone means con butt which i mates "for v '1 111331 she with enopening atits uppersi ollee esting Wlilll the bell, es nozzle, eenieLmeens-csmying the o ger;, fiozzle gen mandrel and; means for;moy'ing the relief," nozzle and mendrel simultaneously inho and out ofposition.

12. Apparatus for manufacturing butt welded. tubesiirom heated metalstrips hav ing, ineoihbinetiOn, e1 hellwith an openingafijts upper side,a roller "co-acting with the bl ya gas nozzle, means for supplying gastoth nozzlem mandrel, means carrying the roller, nozzle and mandrel andmeans for fmovmg' the roller, nozzle and mandrel simultaneously into endoutpf position, said last mentioneii means also turning on Find, oil"the gas supply. v

13. Iii-the manufacture-"of butt Welded V tubes, the comhinetion of ehell or die having a gap therein, a grooved roller operating in the gapand adapted .to co-ec'l, with she die'to-close end-weld the hostedstrip, means for suppoi'tingthe grooved roller in operetive position, emandrel, s gee nozzie eren ifecturing outtyvel'ci ed tuhe's' fromheefieeineielstrips havranged in conjunction with the roller for directing gasinto the hell through the said gap, means for supplying gas to thenozzle, means for controlling the supply of gas, in combination withdrew bench mechanism, and gear mechanism for driving the roller from thesaid drew bench mechanism.

14. linvapperotus for the manufacture of butt Welded tubes from heatedmetal strips and embodying a bell having; on opening in its upper side,means cooperaiing with the said hell for closing ihe edges of the strip,a nozzle fondirecting gas into the bell through said opening, a mandrel,means for aciuating the first recited means, and means common to thefirst recited means, nozzle and mandrel for moving them into and oun of,operative position with respect to the Q1 I i 15. An apparatus for themanufacture of butt Welded tubes from heated metal strips and embodyinga hell havingan opening in its upper side, means cooperating with thesaid bell for closing the edges of the strip, a "gas nozzle fordirecting gas into the bell through said opening, a mandrel, and meanscommon to the first recited means, nozzle and mandrel forslmultnneously" movmg them into and out of operative position.

In testimony whereof I my signature in presence of iwo Witnesses.

FJGKIGLAS' lllilll-ISTER QHISHULM.

Vfitnesses Y? M. Mo'lfineoznri EDWARD l'vioGnnooe NAYLon.

